# -*- autoconf -*-

# Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

dnl Checks for --enable-coverage and updates CFLAGS and LDFLAGS appropriately.
AC_DEFUN([OVS_CHECK_COVERAGE],
  [AC_REQUIRE([AC_PROG_CC])
   AC_ARG_ENABLE(
     [coverage],
     [AC_HELP_STRING([--enable-coverage], 
                     [Enable gcov coverage tool.])],
     [case "${enableval}" in
        (lcov|yes) coverage=true ;;
        (no)  coverage=false ;;
        (*) AC_MSG_ERROR([bad value ${enableval} for --enable-coverage]) ;;
      esac],
     [coverage=false])
   if $coverage; then
     CFLAGS="$CFLAGS -O0 --coverage"
     LDFLAGS="$LDFLAGS --coverage"
   fi])

dnl Checks for --enable-ndebug and defines NDEBUG if it is specified.
AC_DEFUN([OVS_CHECK_NDEBUG],
  [AC_ARG_ENABLE(
     [ndebug],
     [AC_HELP_STRING([--enable-ndebug], 
                     [Disable debugging features for max performance])],
     [case "${enableval}" in
        (yes) ndebug=true ;;
        (no)  ndebug=false ;;
        (*) AC_MSG_ERROR([bad value ${enableval} for --enable-ndebug]) ;;
      esac],
     [ndebug=false])
   AM_CONDITIONAL([NDEBUG], [test x$ndebug = xtrue])])

dnl Checks for struct rtnl_link_stats64.
dnl
dnl (OVS checks for this structure in both kernel and userspace headers.  This
dnl is not redundant, because the kernel and userspace builds have completely
dnl different include paths.  It is possible for the kernel to have this
dnl structure but not userspace, and vice versa.)
AC_DEFUN([OVS_CHECK_RTNL_LINK_STATS64],
  [AC_REQUIRE([OVS_CHECK_NETLINK])
   if test $HAVE_NETLINK = yes; then
     AC_CHECK_MEMBER(
       [struct rtnl_link_stats64.tx_packets],
       [AC_DEFINE([HAVE_RTNL_LINK_STATS64], [1],
                  [Define to 1 if <linux/if_link.h> defines
                   struct rtnl_link_stats64.])],
       [], [#include <sys/socket.h>     /* Provides sa_family_t. */
#include <linux/if_link.h>
])
   fi])

dnl Checks for Netlink support.
AC_DEFUN([OVS_CHECK_NETLINK],
  [AC_CHECK_HEADER([linux/netlink.h],
                   [HAVE_NETLINK=yes],
                   [HAVE_NETLINK=no],
                   [#include <sys/socket.h>
   #include <linux/types.h>
   ])
   AM_CONDITIONAL([HAVE_NETLINK], [test "$HAVE_NETLINK" = yes])
   if test "$HAVE_NETLINK" = yes; then
      AC_DEFINE([HAVE_NETLINK], [1],
                [Define to 1 if Netlink protocol is available.])
   fi])

dnl Checks for OpenSSL.
AC_DEFUN([OVS_CHECK_OPENSSL],
  [AC_ARG_ENABLE(
     [ssl],
     [AC_HELP_STRING([--disable-ssl], [Disable OpenSSL support])],
     [case "${enableval}" in
        (yes) ssl=true ;;
        (no)  ssl=false ;;
        (*) AC_MSG_ERROR([bad value ${enableval} for --enable-ssl]) ;;
      esac],
     [ssl=check])

   if test "$ssl" != false; then
       m4_ifndef([PKG_CHECK_MODULES], [m4_fatal([Please install pkg-config.])])
       PKG_CHECK_MODULES([SSL], [openssl], 
         [HAVE_OPENSSL=yes],
         [HAVE_OPENSSL=no
          if test "$ssl" = check; then
            AC_MSG_WARN([Cannot find openssl:

$SSL_PKG_ERRORS

OpenFlow connections over SSL will not be supported.
(You may use --disable-ssl to suppress this warning.)])
          else
            AC_MSG_ERROR([Cannot find openssl (use --disable-ssl to configure without SSL support)])
          fi])
   else
       HAVE_OPENSSL=no
   fi
   AC_SUBST([HAVE_OPENSSL])
   AM_CONDITIONAL([HAVE_OPENSSL], [test "$HAVE_OPENSSL" = yes])
   if test "$HAVE_OPENSSL" = yes; then
      AC_DEFINE([HAVE_OPENSSL], [1], [Define to 1 if OpenSSL is installed.])
   fi])

dnl Checks for libraries needed by lib/socket-util.c.
AC_DEFUN([OVS_CHECK_SOCKET_LIBS],
  [AC_CHECK_LIB([socket], [connect])
   AC_SEARCH_LIBS([gethostbyname], [resolv], [RESOLVER_LIBS=-lresolv])])

dnl Checks for the directory in which to store the PKI.
AC_DEFUN([OVS_CHECK_PKIDIR],
  [AC_ARG_WITH(
     [pkidir], 
     AC_HELP_STRING([--with-pkidir=DIR], 
                    [PKI hierarchy directory [[DATADIR/openvswitch/pki]]]),
     [PKIDIR=$withval],
     [PKIDIR='${pkgdatadir}/pki'])
   AC_SUBST([PKIDIR])])

dnl Checks for the directory in which to store pidfiles.
AC_DEFUN([OVS_CHECK_RUNDIR],
  [AC_ARG_WITH(
     [rundir], 
     AC_HELP_STRING([--with-rundir=DIR], 
                    [directory used for pidfiles
                    [[LOCALSTATEDIR/run/openvswitch]]]),
     [RUNDIR=$withval],
     [RUNDIR='${localstatedir}/run/openvswitch'])
   AC_SUBST([RUNDIR])])

dnl Checks for the directory in which to store logs.
AC_DEFUN([OVS_CHECK_LOGDIR],
  [AC_ARG_WITH(
     [logdir], 
     AC_HELP_STRING([--with-logdir=DIR], 
                    [directory used for logs [[LOCALSTATEDIR/log/PACKAGE]]]),
     [LOGDIR=$withval],
     [LOGDIR='${localstatedir}/log/${PACKAGE}'])
   AC_SUBST([LOGDIR])])

dnl Defines HAVE_BACKTRACE if backtrace() is declared in <execinfo.h>
dnl and exists in libc.
AC_DEFUN([OVS_CHECK_BACKTRACE],
  [AC_CHECK_HEADER([execinfo.h], [AC_CHECK_FUNCS([backtrace])])])

dnl Checks for __malloc_hook, etc., supported by glibc.
AC_DEFUN([OVS_CHECK_MALLOC_HOOKS],
  [AC_CACHE_CHECK(
    [whether libc supports hooks for malloc and related functions],
    [ovs_cv_malloc_hooks],
    [AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM(
         [#include <malloc.h>
         ], 
         [(void) __malloc_hook;
          (void) __realloc_hook;
          (void) __free_hook;])],
      [ovs_cv_malloc_hooks=yes],
      [ovs_cv_malloc_hooks=no])])
   if test $ovs_cv_malloc_hooks = yes; then
     AC_DEFINE([HAVE_MALLOC_HOOKS], [1], 
               [Define to 1 if you have __malloc_hook, __realloc_hook, and
                __free_hook in <malloc.h>.])
   fi])

dnl Checks for valgrind/valgrind.h.
AC_DEFUN([OVS_CHECK_VALGRIND], 
  [AC_CHECK_HEADERS([valgrind/valgrind.h])])

dnl Checks for Python 2.x, x >= 4.
AC_DEFUN([OVS_CHECK_PYTHON],
  [AC_CACHE_CHECK(
     [for Python 2.x for x >= 4],
     [ovs_cv_python],
     [if test -n "$PYTHON"; then
        ovs_cv_python=$PYTHON
      else
        ovs_cv_python=no
        for binary in python python2.4 python2.5; do
          ovs_save_IFS=$IFS; IFS=$PATH_SEPARATOR
          for dir in $PATH; do
            IFS=$ovs_save_IFS
            test -z "$dir" && dir=.
            if test -x $dir/$binary && $dir/$binary -c 'import sys
if sys.hexversion >= 0x02040000 and sys.hexversion < 0x03000000:
    sys.exit(0)
else:
    sys.exit(1)'; then
              ovs_cv_python=$dir/$binary
              break 2
            fi
          done
        done
      fi])
   AC_SUBST([HAVE_PYTHON])
   AM_MISSING_PROG([PYTHON], [python])
   if test $ovs_cv_python != no; then
     PYTHON=$ovs_cv_python
     HAVE_PYTHON=yes
   else
     HAVE_PYTHON=no
   fi
   AM_CONDITIONAL([HAVE_PYTHON], [test "$HAVE_PYTHON" = yes])])

dnl Checks for dot.
AC_DEFUN([OVS_CHECK_DOT],
  [AC_CACHE_CHECK(
    [for dot],
    [ovs_cv_dot],
    [dnl "dot" writes -V output to stderr:
     if (dot -V) 2>&1 | grep '^dot - [[gG]]raphviz version' >/dev/null 2>&1; then
       ovs_cv_dot=yes
     else
       ovs_cv_dot=no
     fi])
   AM_CONDITIONAL([HAVE_DOT], [test "$ovs_cv_dot" = yes])])

dnl Checks for pyuic4.
AC_DEFUN([OVS_CHECK_PYUIC4],
  [AC_CACHE_CHECK(
    [for pyuic4],
    [ovs_cv_pyuic4],
    [if (pyuic4 --version) >/dev/null 2>&1; then
       ovs_cv_pyuic4=pyuic4
     else
       ovs_cv_pyuic4=no
     fi])
   AM_MISSING_PROG([PYUIC4], [pyuic4])
   if test $ovs_cv_pyuic4 != no; then
     PYUIC4=$ovs_cv_pyuic4
   fi])

dnl Checks whether $PYTHON supports the module given as $1
AC_DEFUN([OVS_CHECK_PYTHON_MODULE],
  [AC_REQUIRE([OVS_CHECK_PYTHON])
   AC_CACHE_CHECK(
     [for $1 Python module],
     [ovs_cv_py_[]AS_TR_SH([$1])],
     [ovs_cv_py_[]AS_TR_SH([$1])=no
      if test $HAVE_PYTHON = yes; then
        AS_ECHO(["running $PYTHON -c 'import $1
import sys
sys.exit(0)'..."]) >&AS_MESSAGE_LOG_FD 2>&1
        if $PYTHON -c 'import $1
import sys
sys.exit(0)' >&AS_MESSAGE_LOG_FD 2>&1; then
          ovs_cv_py_[]AS_TR_SH([$1])=yes
        fi
      fi])])

dnl Checks for Python modules needed by ovsdbmonitor.
AC_DEFUN([OVS_CHECK_OVSDBMONITOR],
  [OVS_CHECK_PYTHON_MODULE([PySide.QtCore])
   OVS_CHECK_PYTHON_MODULE([PyQt4.QtCore])
   OVS_CHECK_PYTHON_MODULE([twisted.conch.ssh])
   OVS_CHECK_PYTHON_MODULE([twisted.internet])
   OVS_CHECK_PYTHON_MODULE([twisted.application])
   OVS_CHECK_PYTHON_MODULE([json])
   OVS_CHECK_PYTHON_MODULE([zope.interface])
   if (test $ovs_cv_py_PySide_QtCore = yes \
       || test $ovs_cv_py_PyQt4_QtCore = yes) \
      && test $ovs_cv_py_twisted_conch_ssh = yes \
      && test $ovs_cv_py_twisted_internet = yes \
      && test $ovs_cv_py_twisted_application = yes \
      && test $ovs_cv_py_json = yes \
      && test $ovs_cv_py_zope_interface = yes; then
     BUILD_OVSDBMONITOR=yes
   else
     BUILD_OVSDBMONITOR=no
   fi
   AC_MSG_CHECKING([whether to build ovsdbmonitor])
   AC_MSG_RESULT([$BUILD_OVSDBMONITOR])
   AM_CONDITIONAL([BUILD_OVSDBMONITOR], [test $BUILD_OVSDBMONITOR = yes])])

# OVS_LINK2_IFELSE(SOURCE1, SOURCE2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# -------------------------------------------------------------
# Based on AC_LINK_IFELSE, but tries to link both SOURCE1 and SOURCE2
# into a program.
#
# This macro is borrowed from acinclude.m4 in GNU PSPP, which has the
# following license:
#
#     Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
#     This file is free software; the Free Software Foundation
#     gives unlimited permission to copy and/or distribute it,
#     with or without modifications, as long as this notice is preserved.
#
m4_define([OVS_LINK2_IFELSE],
[m4_ifvaln([$1], [AC_LANG_CONFTEST([$1])])dnl
mv conftest.$ac_ext conftest1.$ac_ext
m4_ifvaln([$2], [AC_LANG_CONFTEST([$2])])dnl
mv conftest.$ac_ext conftest2.$ac_ext
rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
ovs_link2='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest1.$ac_ext conftest2.$ac_ext $LIBS >&5'
AS_IF([_AC_DO_STDERR($ovs_link2) && {
	 test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest$ac_exeext && {
	 test "$cross_compiling" = yes ||
	 AS_TEST_X([conftest$ac_exeext])
       }],
      [$3],
      [echo "$as_me: failed source file 1 of 2 was:" >&5
sed 's/^/| /' conftest1.$ac_ext >&5
echo "$as_me: failed source file 2 of 2 was:" >&5
sed 's/^/| /' conftest2.$ac_ext >&5
	$4])
dnl Delete also the IPA/IPO (Inter Procedural Analysis/Optimization)
dnl information created by the PGI compiler (conftest_ipa8_conftest.oo),
dnl as it would interfere with the next link command.
rm -rf conftest.dSYM conftest1.dSYM conftest2.dSYM
rm -f core conftest.err conftest1.err conftest2.err
rm -f conftest1.$ac_objext conftest2.$ac_objext conftest*_ipa8_conftest*.oo
rm -f conftest$ac_exeext
rm -f m4_ifval([$1], [conftest1.$ac_ext]) m4_ifval([$2], [conftest1.$ac_ext])[]dnl
])# OVS_LINK2_IFELSE

dnl Defines USE_LINKER_SECTIONS to 1 if the compiler supports putting
dnl variables in sections with user-defined names and the linker
dnl automatically defines __start_SECNAME and __stop_SECNAME symbols
dnl that designate the start and end of the sections.
AC_DEFUN([OVS_CHECK_LINKER_SECTIONS],
  [AC_CACHE_CHECK(
    [for user-defined linker section support],
    [ovs_cv_use_linker_sections],
    [OVS_LINK2_IFELSE(
      [AC_LANG_SOURCE(
        [int a __attribute__((__section__("mysection"))) = 1;
         int b __attribute__((__section__("mysection"))) = 2;
         int c __attribute__((__section__("mysection"))) = 3;])],
      [AC_LANG_PROGRAM(
        [#include <stdio.h>
         extern int __start_mysection;
         extern int __stop_mysection;],
        [int n_ints = &__stop_mysection - &__start_mysection;
         int *i;
         for (i = &__start_mysection; i < &__start_mysection + n_ints; i++) {
             printf("%d\n", *i);
         }])],
      [ovs_cv_use_linker_sections=yes],
      [ovs_cv_use_linker_sections=no])])
   if test $ovs_cv_use_linker_sections = yes; then
     AC_DEFINE([USE_LINKER_SECTIONS], [1],
               [Define to 1 if the compiler support putting variables
                into sections with user-defined names and the linker
                automatically defines __start_SECNAME and __stop_SECNAME
                symbols that designate the start and end of the section.])
   fi
   AM_CONDITIONAL(
     [USE_LINKER_SECTIONS], [test $ovs_cv_use_linker_sections = yes])])

dnl Checks for groff.
AC_DEFUN([OVS_CHECK_GROFF],
  [AC_CACHE_CHECK(
    [for groff],
    [ovs_cv_groff],
    [if (groff -v) >/dev/null 2>&1; then
       ovs_cv_groff=yes
     else
       ovs_cv_groff=no
     fi])
   AM_CONDITIONAL([HAVE_GROFF], [test "$ovs_cv_groff" = yes])])